The nor'easter poses risks to millions across the Northeast, with major cities like Boston, New York, and Washington, DC expected to experience heavy rain and urban flooding. Coastal areas in southeastern Virginia and northeastern North Carolina face high-tide flooding and damaging wind gusts. Flash flooding is possible in the North Carolina mountains and West Virginia, while southeastern Massachusetts and Rhode Island could see up to 8 inches of rain. Offshore waves reaching 20 feet may disrupt marine activities, and strong winds could lead to property damage and power outages.